/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Math/Poisson.h
9 point laplacian with dirichlet boundaries
namespace Chaos { template<class TV, class T, bool NodalValues> void Chaos::Laplacian ( const [TUniformGrid](API\Runtime\Chaos\Chaos\TUniformGrid)< T, 3 > & UniformGrid, const [TArray](API\Runtime\Core\Containers\TArray)< TV > & U, [TArray](API\Runtime\Core\Containers\TArray)< TV > & Lu ) }